Objectives: Despite improvement in overall response due to the introduction of the first-in-class proteasome inhibitor bortezomib (btz), multiple myeloma (MM) is still an incurable disease due to the immune-suppressive bone marrow (BM) environment. Thus, the authors aimed to identify the role of CD11b+CD15+CD14−HLA-DR−granulocytic-like myeloid-derived suppressor cells (PMN-MDSC) in MM patients treated up-front with novel agents. Methods: In MM cell lines and primary cells derived by patients affected by MGUS and MM, we investigated sensitivity to bortezomib and lenalidomide in presence of Arg-1 and PMN-MDSC. Results: The authors found that PMN-MDSC and their function through increased arginase-1 (Arg-1) are associated with MM progression. When the authors assessed cell viability of the human myeloma cell lines MM1.s, OPM2 and U266 treated with 5–20 nM btz for 24 h in PMN-MDSC conditioned media, they disclosed that amount of Arg-1 and Arg-1 inhibition could affect btz sensitivity in-vitro. PMN-MDSC and Arg-1 were increased in peripheral blood of newly diagnosed MM patients compared to healthy subjects. PMN-MDSC and arginase were reduced after exposure to lenalidomide-based regimen but increased after btz-based treatment. Conclusion: In MM, Arg-1 is mainly expressed by PMN-MDSC. PMN-MDSC and Arg-1 are reduced in vivo after lenalidomide but not bortezomib treatment.

PMN-MDSC and arginase are increased in myeloma and may contribute to resistance to therapy

Romano, Alessandra;Parrinello, Nunziatina Laura;La Cava, Piera;Tibullo, Daniele;Giallongo, Cesarina;Camiolo, Giuseppina;Puglisi, Fabrizio;PARISI, MARINA SILVIA;MARTINO, ENRICA ANTONIA;Conticello, Concetta;Palumbo, Giuseppe Alberto;Di Raimondo, Francesco
2018

Abstract

Objectives: Despite improvement in overall response due to the introduction of the first-in-class proteasome inhibitor bortezomib (btz), multiple myeloma (MM) is still an incurable disease due to the immune-suppressive bone marrow (BM) environment. Thus, the authors aimed to identify the role of CD11b+CD15+CD14−HLA-DR−granulocytic-like myeloid-derived suppressor cells (PMN-MDSC) in MM patients treated up-front with novel agents. Methods: In MM cell lines and primary cells derived by patients affected by MGUS and MM, we investigated sensitivity to bortezomib and lenalidomide in presence of Arg-1 and PMN-MDSC. Results: The authors found that PMN-MDSC and their function through increased arginase-1 (Arg-1) are associated with MM progression. When the authors assessed cell viability of the human myeloma cell lines MM1.s, OPM2 and U266 treated with 5–20 nM btz for 24 h in PMN-MDSC conditioned media, they disclosed that amount of Arg-1 and Arg-1 inhibition could affect btz sensitivity in-vitro. PMN-MDSC and Arg-1 were increased in peripheral blood of newly diagnosed MM patients compared to healthy subjects. PMN-MDSC and arginase were reduced after exposure to lenalidomide-based regimen but increased after btz-based treatment. Conclusion: In MM, Arg-1 is mainly expressed by PMN-MDSC. PMN-MDSC and Arg-1 are reduced in vivo after lenalidomide but not bortezomib treatment.
arginase; Btz; multiple myeloma; nor-NOHA; PMN-MDSC; refractoriness; 2734; Molecular Medicine; Molecular Biology; Genetics
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/358759
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